Abstract

The equal channel angular pressing (ECAP) technology seems to be the most promising one among severe plastic deformation techniques and attracts recently a great research attention [1, 2]. However, the structure produced by its application and the creep properties of the resulting materials have not been sufficiently examined as yet [3-9]. In our previous papers [10-13], the grain and subgrain structure of originally coarse-grained pure aluminum (high stacking fault energy) after ECAP and subsequent creep was examined by means of the electron backscatter diffraction (EBSD) at selected lower bounds of the misorientation Δ. The grain and subgrain structures were characterized by the mean area intensity (density) of boundaries and subboundaries per unit volume S and by the mean length intensity (density) of triple grain and subgrain junctions per unit volume L. The structural homogeneity was qualified by the coefficient of variation CV a of the profile areas.